The Periodic Table by WebElements

The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear. The newest elements (113, 115, 117, and 118) are now accepted as discovered and officially part of the periodic table. The discoverors will suggest names shortly for these new elements.

The standard form of the periodic table includes periods (shown horizontally) and groups (shown vertically). Elements in groups have some similar properties to each other. There is no one single or best structure for the periodic table but by whatever consensus there is, the form used here in WebElements is very useful. The periodic table is a masterpiece of organised chemical information. The evolution of chemistry's periodic table into the current form is an astonishing achievement with major contributions from many now famous chemists and other eminent scientists.

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Element 117 discovered

On 1 May 2014 a paper published in Phys. Rev. Lett by J. Khuyagbaatar and others states the superheavy element with atomic number Z = 117 (ununseptium) was produced as an evaporation residue in the ⁴⁸Ca and ²⁴⁹Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allows measurement of decays of single atomic nuclei with very short half-lives . Two decay chains comprising seven α-decays and a spontaneous fission each were identified and assigned to the isotope ²⁹⁴Uus (element 117) and its decay products.